GHSA-vrw4-w73r-6mm8
CRITICALTimelockController vulnerability in OpenZeppelin Contracts
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
Weekly download volume for affected packages — a proxy for how broadly this vulnerability is deployed.
@openzeppelin/contracts-upgradeablenpmDescription
Impact
A vulnerability in TimelockController allowed an actor with the executor role to take immediate control of the timelock, by resetting the delay to 0 and escalating privileges, thus gaining unrestricted access to assets held in the contract. Instances with the executor role set to "open" allow anyone to use the executor role, thus leaving the timelock at risk of being taken over by an attacker.
Patches
A fix is included in the following releases of @openzeppelin/contracts and @openzeppelin/contracts-upgradeable:
- 4.3.1
- 3.4.2
- 3.4.2-solc-0.7
Deployed instances of TimelockController should be replaced with a fixed version by migrating all assets, ownership, and roles.
Workarounds
Revoke the executor role from accounts not strictly under the team's control. We recommend revoking all executors that are not also proposers. When applying this mitigation, ensure there is at least one proposer and executor remaining.
References
Credits
The issue was identified by an anonymous white hat hacker through Immunefi.
For more information
If you have any questions or comments about this advisory, or need assistance executing the mitigation, email us at [email protected].
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | @openzeppelin/contracts-upgradeable | ≥ 4.0.0&&< 4.3.1 | 4.3.1 |
| 📦npm | @openzeppelin/contracts-upgradeable | ≥ 3.3.0&&< 3.4.2 | 3.4.2 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @openzeppelin/contracts-upgradeable. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update @openzeppelin/contracts-upgradeable to 4.3.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-vrw4-w73r-6mm8 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-vrw4-w73r-6mm8 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-vrw4-w73r-6mm8. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-vrw4-w73r-6mm8 in your dependencies?
O3 detects GHSA-vrw4-w73r-6mm8 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.